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![Florian Westphal](/assets/img/avatar_default.png)
This switch (default on) can be used to disable automatic registration of connection tracking functionality in newly created network namespaces. This means that when net namespace goes down (or the tracker protocol module is unloaded) we *might* have to unregister the hooks. We can either add another per-netns variable that tells if the hooks got registered by default, or, alternatively, just call the protocol _put() function and have the callee deal with a possible 'extra' put() operation that doesn't pair with a get() one. This uses the latter approach, i.e. a put() without a get has no effect. Conntrack is still enabled automatically regardless of the new sysctl setting if the new net namespace requires connection tracking, e.g. when NAT rules are created. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
692 lines
16 KiB
C
692 lines
16 KiB
C
/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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* (C) 2005-2012 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/netfilter.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/percpu.h>
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#include <linux/netdevice.h>
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#include <linux/security.h>
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#include <net/net_namespace.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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#endif
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_l3proto.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_acct.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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#include <net/netfilter/nf_conntrack_timestamp.h>
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#include <linux/rculist_nulls.h>
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MODULE_LICENSE("GPL");
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#ifdef CONFIG_NF_CONNTRACK_PROCFS
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void
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print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_l3proto *l3proto,
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const struct nf_conntrack_l4proto *l4proto)
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{
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l3proto->print_tuple(s, tuple);
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l4proto->print_tuple(s, tuple);
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}
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EXPORT_SYMBOL_GPL(print_tuple);
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struct ct_iter_state {
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struct seq_net_private p;
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struct hlist_nulls_head *hash;
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unsigned int htable_size;
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unsigned int bucket;
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u_int64_t time_now;
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};
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static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
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{
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struct ct_iter_state *st = seq->private;
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struct hlist_nulls_node *n;
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for (st->bucket = 0;
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st->bucket < st->htable_size;
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st->bucket++) {
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n = rcu_dereference(
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hlist_nulls_first_rcu(&st->hash[st->bucket]));
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if (!is_a_nulls(n))
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return n;
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}
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return NULL;
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}
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static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
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struct hlist_nulls_node *head)
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{
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struct ct_iter_state *st = seq->private;
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head = rcu_dereference(hlist_nulls_next_rcu(head));
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while (is_a_nulls(head)) {
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if (likely(get_nulls_value(head) == st->bucket)) {
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if (++st->bucket >= st->htable_size)
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return NULL;
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}
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head = rcu_dereference(
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hlist_nulls_first_rcu(&st->hash[st->bucket]));
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}
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return head;
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}
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static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
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{
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struct hlist_nulls_node *head = ct_get_first(seq);
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if (head)
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while (pos && (head = ct_get_next(seq, head)))
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pos--;
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return pos ? NULL : head;
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}
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static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(RCU)
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{
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struct ct_iter_state *st = seq->private;
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st->time_now = ktime_get_real_ns();
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rcu_read_lock();
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nf_conntrack_get_ht(&st->hash, &st->htable_size);
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return ct_get_idx(seq, *pos);
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}
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static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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return ct_get_next(s, v);
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}
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static void ct_seq_stop(struct seq_file *s, void *v)
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__releases(RCU)
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{
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rcu_read_unlock();
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}
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
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{
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int ret;
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u32 len;
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char *secctx;
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ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
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if (ret)
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return;
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seq_printf(s, "secctx=%s ", secctx);
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security_release_secctx(secctx, len);
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}
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#else
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static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
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{
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}
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#endif
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#ifdef CONFIG_NF_CONNTRACK_ZONES
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static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
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int dir)
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{
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const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
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if (zone->dir != dir)
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return;
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switch (zone->dir) {
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case NF_CT_DEFAULT_ZONE_DIR:
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seq_printf(s, "zone=%u ", zone->id);
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break;
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case NF_CT_ZONE_DIR_ORIG:
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seq_printf(s, "zone-orig=%u ", zone->id);
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break;
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case NF_CT_ZONE_DIR_REPL:
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seq_printf(s, "zone-reply=%u ", zone->id);
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break;
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default:
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break;
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}
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}
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#else
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static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
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int dir)
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{
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}
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#endif
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#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
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static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
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{
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struct ct_iter_state *st = s->private;
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struct nf_conn_tstamp *tstamp;
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s64 delta_time;
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tstamp = nf_conn_tstamp_find(ct);
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if (tstamp) {
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delta_time = st->time_now - tstamp->start;
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if (delta_time > 0)
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delta_time = div_s64(delta_time, NSEC_PER_SEC);
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else
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delta_time = 0;
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seq_printf(s, "delta-time=%llu ",
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(unsigned long long)delta_time);
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}
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return;
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}
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#else
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static inline void
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ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
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{
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}
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#endif
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/* return 0 on success, 1 in case of error */
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static int ct_seq_show(struct seq_file *s, void *v)
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{
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struct nf_conntrack_tuple_hash *hash = v;
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struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
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const struct nf_conntrack_l3proto *l3proto;
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const struct nf_conntrack_l4proto *l4proto;
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struct net *net = seq_file_net(s);
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int ret = 0;
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NF_CT_ASSERT(ct);
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if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
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return 0;
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if (nf_ct_should_gc(ct)) {
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nf_ct_kill(ct);
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goto release;
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}
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/* we only want to print DIR_ORIGINAL */
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if (NF_CT_DIRECTION(hash))
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goto release;
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if (!net_eq(nf_ct_net(ct), net))
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goto release;
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l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
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NF_CT_ASSERT(l3proto);
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l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
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NF_CT_ASSERT(l4proto);
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ret = -ENOSPC;
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seq_printf(s, "%-8s %u %-8s %u %ld ",
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l3proto->name, nf_ct_l3num(ct),
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l4proto->name, nf_ct_protonum(ct),
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nf_ct_expires(ct) / HZ);
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if (l4proto->print_conntrack)
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l4proto->print_conntrack(s, ct);
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print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
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l3proto, l4proto);
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ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
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if (seq_has_overflowed(s))
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goto release;
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if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
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goto release;
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if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
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seq_printf(s, "[UNREPLIED] ");
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print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
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l3proto, l4proto);
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ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
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if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
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goto release;
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if (test_bit(IPS_ASSURED_BIT, &ct->status))
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seq_printf(s, "[ASSURED] ");
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if (seq_has_overflowed(s))
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goto release;
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#if defined(CONFIG_NF_CONNTRACK_MARK)
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seq_printf(s, "mark=%u ", ct->mark);
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#endif
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ct_show_secctx(s, ct);
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ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
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ct_show_delta_time(s, ct);
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seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
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if (seq_has_overflowed(s))
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goto release;
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ret = 0;
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release:
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nf_ct_put(ct);
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return ret;
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}
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static const struct seq_operations ct_seq_ops = {
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.start = ct_seq_start,
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.next = ct_seq_next,
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.stop = ct_seq_stop,
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.show = ct_seq_show
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};
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static int ct_open(struct inode *inode, struct file *file)
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{
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return seq_open_net(inode, file, &ct_seq_ops,
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sizeof(struct ct_iter_state));
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}
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static const struct file_operations ct_file_ops = {
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.owner = THIS_MODULE,
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.open = ct_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_net,
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};
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static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
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{
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struct net *net = seq_file_net(seq);
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int cpu;
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if (*pos == 0)
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return SEQ_START_TOKEN;
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for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
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if (!cpu_possible(cpu))
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continue;
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*pos = cpu + 1;
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return per_cpu_ptr(net->ct.stat, cpu);
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}
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return NULL;
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}
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static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct net *net = seq_file_net(seq);
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int cpu;
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for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
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if (!cpu_possible(cpu))
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continue;
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*pos = cpu + 1;
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return per_cpu_ptr(net->ct.stat, cpu);
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}
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return NULL;
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}
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static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
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{
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}
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static int ct_cpu_seq_show(struct seq_file *seq, void *v)
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{
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struct net *net = seq_file_net(seq);
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unsigned int nr_conntracks = atomic_read(&net->ct.count);
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const struct ip_conntrack_stat *st = v;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete search_restart\n");
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return 0;
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}
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seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
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"%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
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nr_conntracks,
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0,
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st->found,
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0,
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st->invalid,
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st->ignore,
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0,
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0,
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st->insert,
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st->insert_failed,
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st->drop,
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st->early_drop,
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st->error,
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st->expect_new,
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st->expect_create,
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st->expect_delete,
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st->search_restart
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);
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return 0;
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}
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static const struct seq_operations ct_cpu_seq_ops = {
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.start = ct_cpu_seq_start,
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.next = ct_cpu_seq_next,
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.stop = ct_cpu_seq_stop,
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.show = ct_cpu_seq_show,
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};
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static int ct_cpu_seq_open(struct inode *inode, struct file *file)
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{
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return seq_open_net(inode, file, &ct_cpu_seq_ops,
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sizeof(struct seq_net_private));
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}
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static const struct file_operations ct_cpu_seq_fops = {
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.owner = THIS_MODULE,
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.open = ct_cpu_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_net,
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};
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static int nf_conntrack_standalone_init_proc(struct net *net)
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{
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struct proc_dir_entry *pde;
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kuid_t root_uid;
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kgid_t root_gid;
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pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
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if (!pde)
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goto out_nf_conntrack;
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root_uid = make_kuid(net->user_ns, 0);
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root_gid = make_kgid(net->user_ns, 0);
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if (uid_valid(root_uid) && gid_valid(root_gid))
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proc_set_user(pde, root_uid, root_gid);
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pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
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&ct_cpu_seq_fops);
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if (!pde)
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goto out_stat_nf_conntrack;
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return 0;
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out_stat_nf_conntrack:
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remove_proc_entry("nf_conntrack", net->proc_net);
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out_nf_conntrack:
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return -ENOMEM;
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}
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static void nf_conntrack_standalone_fini_proc(struct net *net)
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{
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remove_proc_entry("nf_conntrack", net->proc_net_stat);
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remove_proc_entry("nf_conntrack", net->proc_net);
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}
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#else
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static int nf_conntrack_standalone_init_proc(struct net *net)
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{
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return 0;
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}
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static void nf_conntrack_standalone_fini_proc(struct net *net)
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{
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}
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#endif /* CONFIG_NF_CONNTRACK_PROCFS */
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/* Sysctl support */
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#ifdef CONFIG_SYSCTL
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/* Log invalid packets of a given protocol */
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static int log_invalid_proto_min __read_mostly;
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static int log_invalid_proto_max __read_mostly = 255;
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/* size the user *wants to set */
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static unsigned int nf_conntrack_htable_size_user __read_mostly;
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extern unsigned int nf_conntrack_default_on;
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unsigned int nf_conntrack_default_on __read_mostly = 1;
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static int
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nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int ret;
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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if (ret < 0 || !write)
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return ret;
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/* update ret, we might not be able to satisfy request */
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ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
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/* update it to the actual value used by conntrack */
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nf_conntrack_htable_size_user = nf_conntrack_htable_size;
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return ret;
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}
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static struct ctl_table_header *nf_ct_netfilter_header;
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static struct ctl_table nf_ct_sysctl_table[] = {
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{
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.procname = "nf_conntrack_max",
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.data = &nf_conntrack_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "nf_conntrack_count",
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.data = &init_net.ct.count,
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.maxlen = sizeof(int),
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.mode = 0444,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "nf_conntrack_buckets",
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.data = &nf_conntrack_htable_size_user,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
|
|
.proc_handler = nf_conntrack_hash_sysctl,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_checksum",
|
|
.data = &init_net.ct.sysctl_checksum,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_log_invalid",
|
|
.data = &init_net.ct.sysctl_log_invalid,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &log_invalid_proto_min,
|
|
.extra2 = &log_invalid_proto_max,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_expect_max",
|
|
.data = &nf_ct_expect_max,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_default_on",
|
|
.data = &nf_conntrack_default_on,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table nf_ct_netfilter_table[] = {
|
|
{
|
|
.procname = "nf_conntrack_max",
|
|
.data = &nf_conntrack_max,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static int nf_conntrack_standalone_init_sysctl(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
|
|
GFP_KERNEL);
|
|
if (!table)
|
|
goto out_kmemdup;
|
|
|
|
table[1].data = &net->ct.count;
|
|
table[3].data = &net->ct.sysctl_checksum;
|
|
table[4].data = &net->ct.sysctl_log_invalid;
|
|
|
|
/* Don't export sysctls to unprivileged users */
|
|
if (net->user_ns != &init_user_ns)
|
|
table[0].procname = NULL;
|
|
|
|
if (!net_eq(&init_net, net))
|
|
table[2].mode = 0444;
|
|
|
|
net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
|
|
if (!net->ct.sysctl_header)
|
|
goto out_unregister_netfilter;
|
|
|
|
return 0;
|
|
|
|
out_unregister_netfilter:
|
|
kfree(table);
|
|
out_kmemdup:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void nf_conntrack_standalone_fini_sysctl(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = net->ct.sysctl_header->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->ct.sysctl_header);
|
|
kfree(table);
|
|
}
|
|
#else
|
|
static int nf_conntrack_standalone_init_sysctl(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void nf_conntrack_standalone_fini_sysctl(struct net *net)
|
|
{
|
|
}
|
|
#endif /* CONFIG_SYSCTL */
|
|
|
|
static int nf_conntrack_pernet_init(struct net *net)
|
|
{
|
|
int ret;
|
|
|
|
ret = nf_conntrack_init_net(net);
|
|
if (ret < 0)
|
|
goto out_init;
|
|
|
|
ret = nf_conntrack_standalone_init_proc(net);
|
|
if (ret < 0)
|
|
goto out_proc;
|
|
|
|
net->ct.sysctl_checksum = 1;
|
|
net->ct.sysctl_log_invalid = 0;
|
|
ret = nf_conntrack_standalone_init_sysctl(net);
|
|
if (ret < 0)
|
|
goto out_sysctl;
|
|
|
|
return 0;
|
|
|
|
out_sysctl:
|
|
nf_conntrack_standalone_fini_proc(net);
|
|
out_proc:
|
|
nf_conntrack_cleanup_net(net);
|
|
out_init:
|
|
return ret;
|
|
}
|
|
|
|
static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
|
|
{
|
|
struct net *net;
|
|
|
|
list_for_each_entry(net, net_exit_list, exit_list) {
|
|
nf_conntrack_standalone_fini_sysctl(net);
|
|
nf_conntrack_standalone_fini_proc(net);
|
|
}
|
|
nf_conntrack_cleanup_net_list(net_exit_list);
|
|
}
|
|
|
|
static struct pernet_operations nf_conntrack_net_ops = {
|
|
.init = nf_conntrack_pernet_init,
|
|
.exit_batch = nf_conntrack_pernet_exit,
|
|
};
|
|
|
|
static int __init nf_conntrack_standalone_init(void)
|
|
{
|
|
int ret = nf_conntrack_init_start();
|
|
if (ret < 0)
|
|
goto out_start;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
nf_ct_netfilter_header =
|
|
register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
|
|
if (!nf_ct_netfilter_header) {
|
|
pr_err("nf_conntrack: can't register to sysctl.\n");
|
|
ret = -ENOMEM;
|
|
goto out_sysctl;
|
|
}
|
|
|
|
nf_conntrack_htable_size_user = nf_conntrack_htable_size;
|
|
#endif
|
|
|
|
ret = register_pernet_subsys(&nf_conntrack_net_ops);
|
|
if (ret < 0)
|
|
goto out_pernet;
|
|
|
|
nf_conntrack_init_end();
|
|
return 0;
|
|
|
|
out_pernet:
|
|
#ifdef CONFIG_SYSCTL
|
|
unregister_net_sysctl_table(nf_ct_netfilter_header);
|
|
out_sysctl:
|
|
#endif
|
|
nf_conntrack_cleanup_end();
|
|
out_start:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit nf_conntrack_standalone_fini(void)
|
|
{
|
|
nf_conntrack_cleanup_start();
|
|
unregister_pernet_subsys(&nf_conntrack_net_ops);
|
|
#ifdef CONFIG_SYSCTL
|
|
unregister_net_sysctl_table(nf_ct_netfilter_header);
|
|
#endif
|
|
nf_conntrack_cleanup_end();
|
|
}
|
|
|
|
module_init(nf_conntrack_standalone_init);
|
|
module_exit(nf_conntrack_standalone_fini);
|
|
|
|
/* Some modules need us, but don't depend directly on any symbol.
|
|
They should call this. */
|
|
void need_conntrack(void)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL_GPL(need_conntrack);
|